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