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