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