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