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