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