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