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