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