One vertex per element, one color per generator, with an edge from x to x·s.
(5,6,11,15,9,7,10,13)(8,12,18,20,16,14,17,19)(21,22,25,29)(23,30,32,35)(24,26,33,28)(27,31,36,34)(1,2)(3,4)(10,11)(13,15)(17,18)(19,20)(22,26)(24,33)(27,35)(28,29)(30,36)(31,34) involution — undirected(2,4)(5,7,9,6)(8,14,16,12)(10,13,11,15)(17,19,18,20)(5,8,9,16)(6,12,7,14)(10,18,11,17)(13,20,15,19)(21,23,25,32)(22,27,29,36)(24,34,33,31)(26,35,28,30)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.