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