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