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