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