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