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