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