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