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