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