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