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)(19,25)(20,24)(21,26)(22,27)(23,28)(29,32)(30,31) involution — undirected(1,3,5,4)(2,6,8,7)(9,10)(11,14)(12,13)(15,16)(17,19,23,29)(18,24,28,31)(20,21,30,22)(25,27,32,26)(1,3,5,4)(2,7,8,6)(10,13)(14,16)(17,20)(18,25)(19,21)(22,29)(23,30)(24,27)(26,31)(28,32)(1,4,5,3)(2,6,8,7)(9,11)(10,14)(12,15)(13,16)(19,29)(20,30)(24,31)(25,32)(11,15)(14,16)(17,21,23,22)(18,26,28,27)(19,30,29,20)(24,25,31,32)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.