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