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