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