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