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