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