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