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