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