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