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