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