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