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