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