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