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