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