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