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