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