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