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