One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,9)(4,8)(5,16)(6,10)(7,11)(12,15)(13,14)(20,28)(24,29)(26,32)(30,31)(34,40)(35,43)(36,45)(42,44) involution — undirected(1,3,7,4)(2,8,11,9)(5,14,10,12)(6,13,16,15)(17,18)(19,23)(20,29)(21,25)(22,27)(24,28)(26,30)(31,32)(33,34)(35,41)(36,46)(37,45)(38,42)(39,40)(43,48)(44,47)(1,3,7,4)(2,9,11,8)(5,12,10,14)(6,13,16,15)(17,19)(18,22)(20,26)(21,27)(23,25)(24,30)(28,32)(29,31)(33,35,39,43)(34,41,40,48)(36,38,45,47)(37,44,46,42)(1,4,7,3)(2,9,11,8)(5,14,10,12)(6,13,16,15)(17,19)(18,23)(20,26)(21,27)(22,25)(24,31)(28,32)(29,30)(33,36)(34,37)(35,38)(39,45)(40,46)(41,44)(42,48)(43,47)(1,5,7,10)(2,6,11,16)(3,12,4,14)(8,15,9,13)(17,20)(18,24)(19,26)(21,28)(22,30)(23,31)(25,29)(27,32)(33,37)(34,36)(35,44)(38,41)(39,46)(40,45)(42,43)(47,48)(1,6)(2,10)(3,13)(4,15)(5,11)(7,16)(8,12)(9,14)(17,18)(19,22)(20,24)(21,25)(23,27)(26,30)(28,29)(31,32)(33,38)(34,42)(35,45)(36,43)(37,41)(39,47)(40,44)(46,48) involution — undirectedA Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.