One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,5,7)(3,8,4,6)(9,10)(11,13)(12,14)(15,16)(17,18,22,25)(19,23,28,31)(20,24,30,29)(21,27,32,26)(9,10)(11,15)(12,14)(13,16)(17,19,22,28)(18,20,25,30)(21,24,32,29)(23,26,31,27)(1,3,5,4)(2,6,7,8)(9,11,12,16)(10,13,14,15)(17,19)(18,23)(20,27)(21,29)(22,28)(24,32)(25,31)(26,30)(11,16)(13,15)(17,20)(18,24)(19,27)(21,31)(22,30)(23,32)(25,29)(26,28) involution — undirected(1,4,5,3)(2,6,7,8)(10,14)(13,15)(18,25)(19,28)(24,29)(26,27)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.