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