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)(11,13)(12,14)(15,16)(17,18,22,27,25,20,24,31,21,26,30,32,23,19,28,29)(2,5)(6,8)(9,11,12,15)(10,13,14,16)(17,19,22,29,25,18,24,27,21,20,30,31,23,26,28,32)(3,7)(6,8)(10,14)(13,16)(17,20)(18,25)(19,21)(22,27)(23,26)(24,29)(28,31)(30,32) involution — undirected(1,3,4,7)(2,6,5,8)(18,26)(19,20)(27,32)(29,31)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.