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