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