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