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