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