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