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