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