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