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