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