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)(22,26)(23,24)(2,4)(5,7,10,12)(6,11,9,8)(14,17)(18,20)(21,22,25,26)(23,27,24,28)(1,2)(3,4)(13,14)(15,18)(16,17)(19,20)(21,23,25,24)(22,27,26,28)(5,8)(6,7)(9,12)(10,11)(13,14)(15,18)(16,17)(19,20)(21,22)(23,27)(24,28)(25,26) involution — undirected(5,9,10,6)(7,11,12,8)(13,15)(14,18)(16,19)(17,20)(21,24,25,23)(22,27,26,28)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.