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)(13,14,17,18)(15,19,16,20)(21,22,25,28)(23,26,29,33)(24,31,32,27)(30,36,35,34)(7,11)(10,12)(14,18)(19,20)(23,29)(26,33)(30,35)(34,36) involution — undirected(6,9)(10,12)(13,14)(15,20)(16,19)(17,18)(21,23,25,29)(22,26,28,33)(24,30,32,35)(27,34,31,36)(1,2)(3,4)(5,6)(7,10)(8,9)(11,12)(13,15,17,16)(14,19,18,20)(21,22)(23,26)(24,27)(25,28)(29,33)(30,34)(31,32)(35,36)(5,7)(6,10)(8,11)(9,12)(13,16,17,15)(14,20,18,19)(21,24,25,32)(22,27,28,31)(23,30,29,35)(26,34,33,36)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.