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