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