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