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)(17,18,22,26,23,20,21,25)(19,27,31,24,29,32,30,28)(1,3,5,2,7,9,6,10)(4,11,14,8,12,16,13,15)(17,19)(18,24)(20,28)(21,31)(22,30)(23,29)(25,32)(26,27)(1,4)(2,8)(3,11)(5,14)(6,13)(7,12)(9,16)(10,15)(17,20,23,18)(19,28,29,24)(21,25,22,26)(27,31,32,30)(4,12)(8,15)(11,16)(13,14)(19,29)(24,28)(27,32)(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.