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