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