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