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)(11,15)(12,16)(13,14)(17,18)(19,24)(20,26)(21,28)(22,27)(23,29)(25,34)(30,38)(31,40)(32,39)(33,41)(35,43)(36,42)(37,44)(45,48)(46,47) involution — undirected(2,5)(3,7)(10,14)(11,12)(17,19,23,33)(18,24,29,41)(20,30,35,45)(21,31,22,32)(25,37,42,47)(26,38,43,48)(27,39,28,40)(34,44,36,46)(9,11,13,12)(10,15,14,16)(17,20)(18,25)(19,30)(21,34)(22,36)(23,35)(24,37)(26,27)(28,43)(29,42)(31,44)(32,46)(33,45)(38,39)(40,48)(41,47)(1,3,4,7)(2,6,5,8)(10,14)(15,16)(17,20)(18,26)(19,30)(21,36)(22,34)(23,35)(24,38)(25,27)(28,42)(29,43)(31,46)(32,44)(33,45)(37,39)(40,47)(41,48)(2,5)(6,8)(9,12,13,11)(10,15,14,16)(17,21,23,22)(18,27,29,28)(19,31,33,32)(20,34,35,36)(24,39,41,40)(25,26,42,43)(30,44,45,46)(37,38,47,48)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.