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