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