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