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