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