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