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