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