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