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