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