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)(22,26)(23,29)(28,33)(30,35)(5,7,10,9)(6,11,12,8)(14,17)(18,20)(23,29)(27,32)(30,35)(34,36)(6,12)(7,9)(13,14)(15,18)(16,17)(19,20)(21,22)(23,27)(24,28)(25,26)(29,32)(30,34)(31,33)(35,36) involution — undirected(1,2)(3,4)(5,8,10,11)(6,7,12,9)(21,23,25,29)(22,27,26,32)(24,30,31,35)(28,34,33,36)(5,9,10,7)(6,11,12,8)(13,15)(14,18)(16,19)(17,20)(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.