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)(22,26,28,31)(27,35,36,34)(1,2)(3,4)(10,11)(13,15)(17,18)(19,20)(21,22)(23,27)(24,31)(25,28)(26,33)(29,34)(30,36)(32,35) involution — undirected(2,4)(5,7,9,6)(8,14,16,12)(10,13,11,15)(17,19,18,20)(21,23,25,30)(22,27,28,36)(24,32,33,29)(26,34,31,35)(5,8,9,16)(6,12,7,14)(10,18,11,17)(13,20,15,19)(21,22)(23,27)(24,31)(25,28)(26,33)(29,34)(30,36)(32,35)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.