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