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