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