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