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