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