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