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