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