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