One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,8)(4,10)(5,11)(6,14)(7,9)(12,16)(13,15)(17,18)(19,27)(20,31)(21,26)(22,23)(24,30)(25,29)(28,32) involution — undirected(1,3)(2,8)(4,7)(5,12)(6,13)(9,10)(11,16)(14,15)(17,19,23,30)(18,24,22,27)(20,21,29,28)(25,26,31,32)(33,34)(35,41)(36,44)(37,38)(39,42)(40,45)(43,47)(46,48)(2,9)(3,4)(5,15)(6,16)(18,22)(20,29)(21,28)(24,27)(34,38)(35,42)(36,45)(47,48) involution — undirected(1,4,7,3)(2,10,9,8)(5,12,15,14)(6,11,16,13)(17,20)(18,25)(19,28)(21,30)(22,31)(23,29)(24,32)(26,27)(33,35)(34,39)(36,46)(37,42)(38,41)(40,48)(43,45)(44,47)(1,5,7,15)(2,11,9,13)(3,12,4,14)(6,8,16,10)(17,21,23,28)(18,26,22,32)(19,29,30,20)(24,31,27,25)(33,36)(34,40)(35,43)(37,45)(38,44)(39,47)(41,48)(42,46)(1,6)(2,12)(3,13)(4,11)(5,8)(7,16)(9,14)(10,15)(17,22,23,18)(19,27,30,24)(20,31,29,25)(21,32,28,26)(33,34)(35,39)(36,40)(37,38)(41,42)(43,47)(44,45)(46,48)A 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.