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