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