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